return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for C2H4O (Ethylene oxide)

using model chemistry: HF/CEP-121G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at HF/CEP-121G
 hartrees
Energy at 0K-28.866543
Energy at 298.15K 
HF Energy-28.866543
Nuclear repulsion energy41.994023
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at HF/CEP-121G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3294 3006 6.12 203.71 0.10 0.19
2 A1 1654 1509 0.94 4.00 0.35 0.52
3 A1 1372 1252 9.49 34.65 0.13 0.23
4 A1 1248 1139 0.12 14.47 0.16 0.28
5 A1 897 819 102.08 15.99 0.69 0.82
6 A2 3392 3095 0.00 102.11 0.75 0.86
7 A2 1283 1171 0.00 3.69 0.75 0.86
8 A2 1118 1020 0.00 0.01 0.75 0.86
9 B1 3408 3110 56.20 10.95 0.75 0.86
10 B1 1227 1120 8.39 12.38 0.75 0.86
11 B1 887 810 0.73 5.23 0.75 0.86
12 B2 3276 2990 33.63 7.31 0.75 0.86
13 B2 1621 1479 0.29 4.23 0.75 0.86
14 B2 1271 1160 5.17 2.23 0.75 0.86
15 B2 874 798 7.02 18.23 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 13412.5 cm-1
Scaled (by 0.9125) Zero Point Vibrational Energy (zpe) 12238.9 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at HF/CEP-121G
ABC
0.82023 0.73191 0.45686

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/CEP-121G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.877
C2 0.000 0.741 -0.388
C3 0.000 -0.741 -0.388
H4 0.911 1.273 -0.591
H5 -0.911 1.273 -0.591
H6 -0.911 -1.273 -0.591
H7 0.911 -1.273 -0.591

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5 H6 H7
O11.46601.46602.14622.14622.14622.1462
C21.46601.48111.07411.07412.21882.2188
C31.46601.48112.21882.21881.07411.0741
H42.14621.07412.21881.82123.12962.5451
H52.14621.07412.21881.82122.54513.1296
H62.14622.21881.07413.12962.54511.8212
H72.14622.21881.07412.54513.12961.8212

picture of Ethylene oxide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 59.661 O1 C2 H4 114.440
O1 C2 H5 114.440 O1 C3 C2 59.661
O1 C3 H6 114.440 O1 C3 H7 114.440
C2 O1 C3 60.679 C2 C3 H6 119.691
C2 C3 H7 119.691 C3 C2 H4 119.691
C3 C2 H5 119.691 H4 C2 H5 115.944
H6 C3 H7 115.944
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/CEP-121G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.400      
2 C -0.102      
3 C -0.102      
4 H 0.151      
5 H 0.151      
6 H 0.151      
7 H 0.151      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -2.904 2.904
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -17.265 0.000 0.000
y 0.000 -16.021 0.000
z 0.000 0.000 -21.822
Traceless
 xyz
x 1.657 0.000 0.000
y 0.000 3.522 0.000
z 0.000 0.000 -5.179
Polar
3z2-r2-10.358
x2-y2-1.244
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.074 0.000 0.000
y 0.000 4.314 0.000
z 0.000 0.000 3.014


<r2> (average value of r2) Å2
<r2> 32.876
(<r2>)1/2 5.734